Kibana Log File not created

Hi,
Recently we notice that kibana log file that should be written to the path :
/var/log/kibana/kibana.log
was not written for a long time.

this is the kibana.yml :

# Kibana is served by a back end server. This setting specifies the port to use.
#server.port: 5601

# Specifies the address to which the Kibana server will bind. IP addresses and host names are both valid values.
# The default is 'localhost', which usually means remote machines will not be able to connect.
# To allow connections from remote users, set this parameter to a non-loopback address.
#server.host: "********"
server.host: "********"

# Enables you to specify a path to mount Kibana at if you are running behind a proxy.
# Use the `server.rewriteBasePath` setting to tell Kibana if it should remove the basePath
# from requests it receives, and to prevent a deprecation warning at startup.
# This setting cannot end in a slash.
#server.basePath: ""

# Specifies whether Kibana should rewrite requests that are prefixed with
# `server.basePath` or require that they are rewritten by your reverse proxy.
# This setting was effectively always `false` before Kibana 6.3 and will
# default to `true` starting in Kibana 7.0.
#server.rewriteBasePath: false

# Specifies the public URL at which Kibana is available for end users. If
# `server.basePath` is configured this URL should end with the same basePath.
#server.publicBaseUrl: ""

# The maximum payload size in bytes for incoming server requests.
#server.maxPayloadBytes: 1048576

# The Kibana server's name.  This is used for display purposes.
#server.name: "your-hostname"

# The URLs of the Elasticsearch instances to use for all your queries.

elasticsearch.hosts: ["************************************************"]
#elasticsearch.hosts: ["********", "********", "********"]

# Kibana uses an index in Elasticsearch to store saved searches, visualizations and
# dashboards. Kibana creates a new index if the index doesn't already exist.
#kibana.index: ".kibana"

# The default application to load.
#kibana.defaultAppId: "home"

# If your Elasticsearch is protected with basic authentication, these settings provide
# the username and password that the Kibana server uses to perform maintenance on the Kibana
# index at startup. Your Kibana users still need to authenticate with Elasticsearch, which
# is proxied through the Kibana server.
elasticsearch.username: "********"
elasticsearch.password: "********"

# Enables SSL and paths to the PEM-format SSL certificate and SSL key files, respectively.
# These settings enable SSL for outgoing requests from the Kibana server to the browser.
server.ssl.enabled: true
server.ssl.certificate: "********"
server.ssl.key: "********"

# Optional settings that provide the paths to the PEM-format SSL certificate and key files.
# These files are used to verify the identity of Kibana to Elasticsearch and are required when
# xpack.security.http.ssl.client_authentication in Elasticsearch is set to required.
elasticsearch.ssl.certificate: "********"
elasticsearch.ssl.key: "********"

# Optional setting that enables you to specify a path to the PEM file for the certificate
# authority for your Elasticsearch instance.
elasticsearch.ssl.certificateAuthorities: [ "********" ]

# To disregard the validity of SSL certificates, change this setting's value to 'none'.
#elasticsearch.ssl.verificationMode: full

# Time in milliseconds to wait for Elasticsearch to respond to pings. Defaults to the value of
# the elasticsearch.requestTimeout setting.
#elasticsearch.pingTimeout: 1500

# Time in milliseconds to wait for responses from the back end or Elasticsearch. This value
# must be a positive integer.
#elasticsearch.requestTimeout: 30000

# List of Kibana client-side headers to send to Elasticsearch. To send *no* client-side
# headers, set this value to [] (an empty list).
#elasticsearch.requestHeadersWhitelist: [ authorization ]

# Header names and values that are sent to Elasticsearch. Any custom headers cannot be overwritten
# by client-side headers, regardless of the elasticsearch.requestHeadersWhitelist configuration.
#elasticsearch.customHeaders: {}

# Time in milliseconds for Elasticsearch to wait for responses from shards. Set to 0 to disable.
#elasticsearch.shardTimeout: 30000

# Logs queries sent to Elasticsearch. Requires logging.verbose set to true.
#elasticsearch.logQueries: true

# Specifies the path where Kibana creates the process ID file.
#pid.file: /run/kibana/kibana.pid

# Enables you to specify a file where Kibana stores log output.
#logging.dest: stdout

# Set the value of this setting to true to suppress all logging output.
#logging.silent: false

# Set the value of this setting to true to suppress all logging output other than error messages.
#logging.quiet: false

# Set the value of this setting to true to log all events, including system usage information
# and all requests.
#logging.verbose: true

# Set the interval in milliseconds to sample system and process performance
# metrics. Minimum is 100ms. Defaults to 5000.
#ops.interval: 5000

# Specifies locale to be used for all localizable strings, dates and number formats.
# Supported languages are the following: English - en , by default , Chinese - zh-CN .
#i18n.locale: "en"
xpack.encryptedSavedObjects.encryptionKey: "asdfghjklqwertyuiopzxcvbnmsdfgqw"
xpack.security.loginHelp: "**Help** info with a [link](...)"
xpack.security.authc.providers:
#  basic.native1:
#    order: 0
#    icon: "logoElasticsearch"
#    hint: "Typically for administrators"
  basic.ad1:
    order: 0
    icon: "logoElasticsearch"
    hint: "Typically for administrators"
#  saml.saml1:
#    order: 1
#    realm: saml1
#    description: "Log in with SSO"
#    icon: "https://my-company.xyz/saml-logo.svg"
#  saml.saml2:
#    order: 2
#    realm: saml2
#    showInSelector: false
#  kerberos.kerberos1:
#    order: 3
#    enabled: false


monitoring.ui.ccs.enabled: false
xpack.reporting.enabled: true
xpack.reporting.csv.maxSizeBytes: 104857600
xpack.security.session.idleTimeout: "24h"
#xpack.reporting.queue.timeout : 600000

logging:
  root:
    level: info

how can i troubleshoot this problem ?
Thanks!

Kibana 6.3 is EOL and no longer supported. Please upgrade ASAP.

(This is an automated response from your friendly Elastic bot. Please report this post if you have any suggestions or concerns :elasticheart: )

our kibana version is 8.1.3

issue solved!
i added in the yml file this configuration and its help :

logging:
  appenders:
    file:
      type: file
      fileName: /var/log/kibana.log
      layout:
        type: pattern
  root:
    appenders: [file]

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